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Method and system of communicating devices, and devices therefor, with protected data transfer

  • US 7,828,218 B1
  • Filed: 07/20/2000
  • Issued: 11/09/2010
  • Est. Priority Date: 07/20/2000
  • Status: Active Grant
First Claim
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1. A method of communicating between at least a first device and a second device;

  • the first device comprising a first processor, first memory means and first input/output means, said first memory means and first input/output means being coupled to said first processor;

    the second device comprising a second processor, second memory means and second input/output means, said second memory means and second input/output means being coupled to said second processor;

    said method comprising at least the following steps carried out by said first processor;

    a. carrying out a first program step in accordance with a predetermined first program;

    b. establishing first state data related to said first program after having carried out said first program step;

    c. transmitting in accordance with said first program a first communication primitive including first additional data having a first predetermined relationship with said first state data;

    followed by the following steps by said second processor;

    d. receiving said first communication primitive;

    e. extracting said first additional data from said first communication primitive and storing said first additional data in said second memory means;

    f. carrying out a second program step in accordance with a second program;

    g. reading said first additional data from said second memory;

    h. transmitting in accordance with said second program to said first device a second communication primitive including second additional data having a second predetermined relationship with said first additional data;

    followed by the following steps carried out by said first processor;

    i. receiving said second communication primitive;

    j. extracting said second additional data from said second communication primitive and deriving said first additional data from said second additional data;

    k. checking whether said derived first additional data has said first predetermined relationship with said first state data;

    if not, either discontinuing said first program or starting a recovery process;

    if so, continuing with;

    l. carrying out a third program step in accordance with said first program.

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